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Relationship Between Subcrown Internode Length and Winter Survival in Winter Barley¹

The relationship between subcrown internode length and winter survival in winter barley (Hordeum vulgare L.) was investigated by measuring the subcrown internode length of 29 winter barley lines from the 1982 Barley Winterhardiness Nursery in a controlled environment. Subcrown internode length has been suggested as a factor affecting winter survival in winter cereals. In this study, ‘Mo. Early Beardless’ produced the longest subcrown internode (5.7 cm) and SD 79-4 the shortest (1.8 cm). Five winterhardy lines of South Dakota origin were identified as a unique group of germplasm lines having both short subcrown internodes and relatively long coleoptiles. In general, strains developed in regions where a high level of winterhardiness is required had the shortest subcrown internodes. A highly significant correlation coefficient of –0.57 was obtained between subcrown internode length and mean winter survival at 29 locations, suggesting that short subcrown internodes (or deep crowns) are associated with higher levels of winter survival over a wide range of environments under relatively snow-free conditions.

Key Words: Crown depth • Hordeum vulgare L. • Winterhardiness • Cold injury

² Graduate research assistant and foundation professor of agronomy, respectively, Univ. of Nebraska, Lincoln, NE 68583. Senior author is currently with DeKalb-Pfizer Genetics, Grand Island, NE 68801.

Received for publication July 2, 1984.